Hers Ball Crunch

Crunches on a stability Ball are one of the best ways to help develop
strong defined abs. The added benefit of using a ball help support the
lower back allowing for you to have full extension in the mid-section ad
crunch to full flexion in the abdominal area with having complete
support. the ball does not allow you to cheat and adding the cable with
weight can make this movement a bit more difficult.